<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action = "servlet1" method = "post">
    用户名：
    <input type = "text" name = "username">
    <input type = "submit" value = "提交">
</form>
</body>
</html>